Navigation problem: Robot does not move while there is no obstacle

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Hi I am using simulated robot Rosbot2.0. I wrote: the lunch file for the navigation stack with all required yaml files. However, the robot does not move.

Here is my lanuch file: rosbot_navigation_move_rosbot.launch

<launch>
     <arg name="use_rosbot" default="false"/>
<arg name="use_gazebo" default="true"/>

<param if="$(arg use_gazebo)" name="use_sim_time" value="true"/>

 <!-- Bring the ROSbot model and show it in Gazebo and in Rviz  -->
 <include file="$(find rosbot_description)/launch/rosbot_rviz.launch"/>

<!-- Map server -->
<arg name="map_file" default="$(find rosbot_navigation)/maps/gridMap8by8.yaml"/>
<node name="map_server" pkg="map_server" type="map_server" args="$(arg map_file)" />

<!--- tf -->
<node if="$(arg use_rosbot)" pkg="tf" type="static_transform_publisher" name="base_link_to_laser" args="0 0 0 3.14 0 0 base_link laser 100" />


<node name="spawn_urdf" pkg="gazebo_ros" type="spawn_model" args="-param robot_description -urdf -x 5.5 -y 6.5 -z 0.0 -model rosbot" />

<node pkg="joint_state_publisher" type="joint_state_publisher" name="joint_state_publisher">
<param name="publish_frequency" type="double" value="30.0" />
</node>

 <!--- Localization: Run AMCL -->
<node pkg="amcl" type="amcl" name="amcl" output="screen">
    <remap from="scan" to="/scan"/>
    <param name="odom_frame_id" value="odom"/>
    <!-- <param name="odom_model_type" value="diff-corrected"/> --> 
    <param name="odom_model_type" value="diff"/>
    <param name="base_frame_id" value="base_link"/>
    <param name="update_min_d" value="0.05"/>
    <param name="update_min_a" value="0.1"/>
    <param name="min_particles" value="500"/>
    <param name="max_particles" value="10000"/>
    <param name="initial_pose_x" value="5.5"/>
    <param name="initial_pose_y" value="6.5"/>
</node>

<!-- Move base -->
<node pkg="move_base" type="move_base" name="move_base" output="screen">
    <param name="controller_frequency" value="2.0"/>
    <rosparam file="$(find rosbot_navigation)/config/costmap_common_params.yaml" command="load" ns="global_costmap" />
    <rosparam file="$(find rosbot_navigation)/config/costmap_common_params.yaml" command="load" ns="local_costmap" />
    <rosparam file="$(find rosbot_navigation)/config/local_costmap_params.yaml" command="load" />
    <rosparam file="$(find rosbot_navigation)/config/global_costmap_params.yaml" command="load" />
    <rosparam file="$(find rosbot_navigation)/config/trajectory_planner.yaml" command="load" />
</node>

</launch>

The yaml files: costmap_common_params.yaml

obstacle_range: 6.0
raytrace_range: 8.5
footprint: [[0.12, 0.14], [0.12, -0.14], [-0.12, -0.14], [-0.12, 0.14]]
map_topic: /map
subscribe_to_updates: true
observation_sources: laser_scan_sensor
laser_scan_sensor: {sensor_frame: laser, data_type: LaserScan, topic: scan, marking: true, clearing: true}
global_frame: map 
robot_base_frame: base_link
always_send_full_costmap: true

global_costmap_params.yaml

  global_costmap:
      global_frame: map
      update_frequency: 0.5
      publish_frequency: 1.5
      transform_tolerance: 0.5
      width: 8
      height: 8
      origin_x: 0
      origin_y: 0
      rolling_window: false
      inflation_radius: 0.0 
      cost_scaling_factor: 1.0 
      resolution: 1
      plugins:
    - {name: static_layer, type: "costmap_2d::StaticLayer"}

local_costmap_params.yaml

local_costmap:
  global_frame: odom
  update_frequency: 2.5
  publish_frequency: 2.5
  transform_tolerance: 0.25
  static_map: false 
  rolling_window: true
  width: 3 
  height: 3
  origin_x: 0
  origin_y: 0
  resolution: 1
   inflation_radius: 0.0 
   cost_scaling_factor: 1.0

trajectory_planner.yaml

   TrajectoryPlannerROS:
 max_vel_x: 0.1
 min_vel_x: 0.05
 max_vel_theta: 2.5
 min_vel_theta: -2.5
 min_in_place_vel_theta: 0.5
 acc_lim_theta: 1.0
 acc_lim_x: 1.5
 acc_lim_Y: 1.5
 holonomic_robot: false

 xy_goal_tolerance: 1.0 # was 0.1
 yaw_goal_tolerance: 6.26 ...